Wave Processes

Essential parts of the middle atmosphere circulation are driven by waves – the investigation of related processes is matter of this topic. Prominent examples are planetary and synoptic Rossby waves and mesoscale inertia-gravity waves. We study their life cycle from their generation through their propagation until they break and influence the mean flow. Thermal tides are a closely related subject.

Methods

In order to extract information from observations and analyses and model simulations, distributions of Ertels Potential Vorticity, the three-dimensional wave activity flux, lag-correlations and several methods for the diagnosis of Rossby wave trains are used. For the study of gravity waves analytical models are continuously developed further. Numerical simulations are utilizing a variety of mesoscale and global models (for example KMCM or UA-ICON) and linearized versions thereof (LIN-KMCM). For selected case studies, IAP-based observations with radiosondes, radars and lidars are used and compared with numerical simlations.

• Amiramjadi, M., R. Plougonven, A. R. Mohebalhojeh & M. Mirzaei, 2023: Using machine learning to estimate non-orographic gravity wave characteristics at source levels. J. Atmos. Sci. 80,  2: 419-440, doi:10.1175/jas-d-22-0021.1.
• Chau, J. L., W. J. Longley, P. M. Reyes, N. M. Pedatella, Y. Otsuka, C. Stolle, H. Liu, S. L. England, J. P. Vierinen, M. A. Milla, D. L. Hysell, M. M. Oppenheim, A. Patra, G. Lehmacher & E. Kudeki, 2023: Solved and unsolved riddles about low-latitude daytime valley region plasma waves and 150-km echoes. Front. Astron. Space Sci. 10: 1091319, doi:10.3389/fspas.2023.1091319.
• Chen, S. S., Y. Yamazaki, C. M. Denardini, L. C. A. Resende, R. A. J. Chagas & C. Stolle, 2024: Tidal Composition Analysis of Global Sq Current System. J. Geophys. Res. Space Physics 129,  5, doi:10.1029/2023ja032382.
• Ghosh, P., T. Renkwitz, R. Latteck, V. Avsarkisov & J. L. Chau, 2023: Momentum Flux and Vertical Wind Power Spectral Characteristics in the Troposphere and Lower Stratosphere Over Andøya, Norway as Observed by MAARSY. Geophys. Res. Lett. 50,  8, doi:10.1029/2022gl101524.
• Jadhav, A. P., Y. Yamazaki, S. Gurubaran, C. Stolle, J. F. Conte, P. P. Batista & R. A. Buriti, 2024: Quasi 16-Day Wave Signatures in the Interhemispheric Field Aligned Currents: A New Perspective Toward Atmosphere-Ionosphere Coupling. J. Geophys. Res. Space Physics 129,  6: 032383, doi:10.1029/2023ja032383.
• Khadka, S. M., F. Gasperini, C. Stolle & J. Oberheide, 2024: Large-Scale Wave-Driven Interactions and Plasma-Neutral Coupling in the Low-Latitude Ionosphere-Thermosphere. J. Geophys. Res. Space Physics 129,  5: 032535, doi:10.1029/2024ja032535.
• Qiu, L., Y. Yamazaki, T. Yu, Y. Miyoshi & X. Zuo, 2023: Numerical Investigation on the Height and Intensity Variations of Sporadic E Layers at Mid-Latitude. J. Geophys. Res. Space Physics 128,  9: 031508, doi:10.1029/2023ja031508.
• Siddiqui, T. A., J. L. Chau, C. Stolle & Y. Yamazaki, 2022: Migrating solar diurnal tidal variability during Northern and Southern Hemisphere Sudden Stratospheric Warmings. Earth Planets Space 74,  1, doi:10.1186/s40623-022-01661-y.
• Yamazaki, Y. & T. A. Siddiqui, 2024: Symmetric and Antisymmetric Solar Migrating Semidiurnal Tides in the Mesosphere and Lower Thermosphere. J. Geophys. Res. Space Physics 129,  12: 040222, doi:10.1029/2023jd040222.
• Yamazaki, Y., C. Stolle, C. Xiong, P. Alken, Y. Yang, Z. Zhima, B. Harding & R. Yan, 2024: Day-to-day and longitudinal variability of the equatorial electrojet as viewed from the Sun-synchronous CSES satellite. Front. Astron. Space Sci. 11: 1460312, doi:10.3389/fspas.2024.1460312.